Like many here, loved part 1...was not so keen on parts 2 and 3 although, oddly enough, I did see part 2 in the theater when it first came out.
I have the "Back to the Future" DVD set...love the deleted scenes feature from part 1!
MARTY (as Darth Vader, holding a hair dryer): My heat ray will vaporize you if you do not obey me!
GEORGE: Okay, okay. I surrender, I surrender.
MARTY: You, George McFly, have created a rift in the space-time continuum!
GEORGE: I'm sorry. I didn't mean it.
MARTY: Sorry doesn't cut it, George. The Supreme Klingon hereby commands you to bring the female unit known as Baines Lorraine to the place called Hill Valley High School exactly four Earth cycles from now. That's this Saturday night, George.
Classic parody of bad Fifties science fiction with clever pop culture references thrown in. I wonder why this scene got cut.